ZACH LUO AND CHIP COHEN ARE DETERMINED TO FIND OUT WHY EVERYONE AT SCHOOL IS GETTING SICK! AFTER ACCUSING THE SCARY CHEF VLADIMIR OF POISONING KIDS, HE IS FIRED FROM THE SCHOOL... BUT THE SICKNESS CONTINUES! ASSUMING VLADIMIR IS SNEAKING INTO THE SCHOOL, THEY CONDUCT A LATE-NIGHT MISSION TO CATCH HIM... BUT ARE MET WITH THE TRUE VILLAIN, CHEF PIERRE, WHO THEY THOUGHT LOOKED FRIENDLY! WHEN VLADIMIR SAVES ZACH AND CHIP FROM PIERRE, HIS JOB IS REINSTATED, AND THE BOYS LEARN A LESSON ABOUT JUDGING APPEARANCES AND JUMPING TO CONCLUSIONS.